Other mistake: In addition to the brake lights, there are no lights at all on the back of the car when you see it driven from behind. However, you can see that the lights are on from the front of the car.
Other mistake: When Jamie is trying to tell everyone that Tina is at a store, Dr Loomis says "Store? What kind of store? What do they sell there?" However, the captions say "Store? What kind of store do they sell there?"
Other mistake: After being shot by the police, Michael has no blood, bullet holes or any injury.
Answer: Director Dominique Othenin-Girard made the puzzling decision to try and humanize Michael in this film by showing he still had some traces of emotion that could be momentarily reached. Thus when Jamie talks to him, he briefly recovers his humanity, takes off his mask and sheds a single tear. Othenin-Girard felt that this made Michael more frightening, because his evil was so great that even if he still had regular emotions that occasionally emerged, the evil inside of him would eventually take over. But it does kind of come out of nowhere and contradict the other films... hence this idea was more-or-less ignored in future sequels.
TedStixon